A spring balance is acted upon by two forces $3 N$ each on two ends as shown in figure. Reading in spring balance will be

3 N

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6 N

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9 N

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zero

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Solution

The correct option is A 3 N
The spring balance shows the reading corresponding to the force at any end of the spring balance.
The force at the two ends is equal in magnitude. Otherwise, the spring balance is in motion and decided by the resultant force. So, the reading in spring balance is $3 N$ .
The correct option is A.

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